Target Recognition with Missing Stepped Frequency Backscatter

Author(s):  
Ismail Jouny
2014 ◽  
Vol 513-517 ◽  
pp. 4000-4003 ◽  
Author(s):  
Kun Chen ◽  
Yue Hua Li

In this paper, the idea of manifold learning is introduced into Stepped Frequency Radar (SFR) target recognition, a new method based on Locality Preserving Projections (LPP) algorithm and k-nearest neighbour classification for Stepped Frequency Radar target recognition is proposed. LPP is a subspace analytical method based on manifold learning, which is used to reduce the dimension of the High Resolution Range Profile (HRRP) and extract features from HRRP. The feature extraction method by LPP not only preserves the global topology structure, but also captures the local information of the different targets. Then three kinds of target are classified by k-nearest neighbour classification after the LPP. Experimental results on the three different targets suggest that the proposed method has the capability of finding the low-dimensional manifold structure embedded in the high-dimensional HRRP space and can provide a higher recognition rate in Stepped Frequency Radar target recognition.


1979 ◽  
Author(s):  
William L. Warnick ◽  
Garvin D. Chastain ◽  
William H. Ton

1959 ◽  
Author(s):  
Charles A. Baker ◽  
Dominic F. Morris ◽  
William C. Steedman
Keyword(s):  

2020 ◽  
pp. 1-12
Author(s):  
Changxin Sun ◽  
Di Ma

In the research of intelligent sports vision systems, the stability and accuracy of vision system target recognition, the reasonable effectiveness of task assignment, and the advantages and disadvantages of path planning are the key factors for the vision system to successfully perform tasks. Aiming at the problem of target recognition errors caused by uneven brightness and mutations in sports competition, a dynamic template mechanism is proposed. In the target recognition algorithm, the correlation degree of data feature changes is fully considered, and the time control factor is introduced when using SVM for classification,At the same time, this study uses an unsupervised clustering method to design a classification strategy to achieve rapid target discrimination when the environmental brightness changes, which improves the accuracy of recognition. In addition, the Adaboost algorithm is selected as the machine learning method, and the algorithm is optimized from the aspects of fast feature selection and double threshold decision, which effectively improves the training time of the classifier. Finally, for complex human poses and partially occluded human targets, this paper proposes to express the entire human body through multiple parts. The experimental results show that this method can be used to detect sports players with multiple poses and partial occlusions in complex backgrounds and provides an effective technical means for detecting sports competition action characteristics in complex backgrounds.


2019 ◽  
Author(s):  
Maria Teresa Odinolfi ◽  
Alessandro Romanato ◽  
Greta Bergamaschi ◽  
Alessandro Strada ◽  
Laura Sola ◽  
...  

The use of peptides in paper-based analytics is a highly appealing field, yet it suffers from severe limitations. This is mostly due to the loss of effective target recognition properties of this relatively small bioprobes upon nonspecific adsorption onto cellulose substrates. Here, we address this issue by introducing a simple polymer-based strategy to obtain clickable cellulosic surfaces, that we exploited for the chemoselective bioconjugation of peptide bioprobes. Our method largely outperformed standard adsorption-based immobilization strategy in a challenging, real-case immunoassay, namely the diagnostic discrimination of Zika+ individuals from healthy controls. Of note, the clickable polymeric coating not only allows efficient peptides bioconjugation, but it provides favorable anti-fouling properties to the cellulosic support. We envisage our strategy to broaden the repertoire of cellulosic materials manipulation and promote a renewed interest in peptide-based paper bioassays.


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